Valve.



PATENTED NOV. 17, 1903.

L. & J. S. SWE NSON.

VALVE.

APPLICATION nun APR. 23 1903.

N0 Mon EL.

0 mm d A m m w Amm m UNITED STATES Patented i\lovemloer 1'7, 1903.

LORENS SVVENSON AND JOHN S. SWENS ON, OF CRESCO, IOW'A.

VALVE.

SPECIFICATION forming part of Letters Patent No. 744,433, dated November 17, 1903.

Application filed April 23. 1903.

To all whom it may concern:

Be it known that we, LORENS SWENSON and JOHN S.'SWENsON, citizens of the United States, residing at Oresco, in the county of Howard and State of Iowa, haveinvcnted new and usefullmprovements in Valves, of which the following is a specification.

This invention relates to reciprocating valves, and is designed more particularly as an improvement upon the self-grinding valve constituting the subject-matter of Letters Patent No. 616,275, of December 20, 1898.

The object of the present invention is to provide a simple and durable construction which will permit the stem of the valve to make a partial turn with respect to the valvedisk at the commencement of the opening of the valve, this with a view of lessening the pressure of the disk against its seat at such time and rendering the valve easy to open without interfering with the self-grinding capability thereof.

With the foregoing in mind the invention will be fully understood from the following description and claims when taken in connection with the accompanying drawings, in which a v Figure 1 is a vertical section of the valve constituting the preferred embodiment of the invention; Fig. 2, a detail horizontal section taken in the plane indicated by the broken line 2 2 of Fig. 1, and Fig. 3am inverted perspective view of the lower-end of the improved valve-stem.

Similar letters of reference designate corresponding parts in all of the views of the drawings. a

In common with the valve disclosed in the aforesaid Letters Patent the valve constituting the preferred embodiment of our present invention comprises a casing A, having a dia phragm a, a valve-seat b, a detachable interiorly-threaded bonnet 0, provided with inte rior guide-lugs c and a packing-gland d, arranged on the bonnet,a valve-stem B,threaded at e and provided at its upper end with a handle f, a nutO, mounted upon the threaded portion 6 of the stern and having a flange 9,

provided with peripheral notches h, which receive the interior lugs c of the bonnet, and a helical spring D, which surrounds the stem Serial No. 154,015. (No modeld Within the bonnet and isinterposed between the nut O and the top of the bonnet.

- E is the improved disk of the present valve. This disk is shaped to rest on the seat I) of easing A and is provided in its upper side with a circular recess 12, the upper portion of the side wall of which is threaded, as indicated byj, for the engagement of an annular nut F, which rests in the recess and bears on the disk. Said disk is also provided in the bottom of the recess 2' with a central rounded depression 79 and on the side wall of said recess with diametrically opposite abutments Z, preferably sector-shaped, as shown in Fig. 2.

G is a head or enlargement, preferably formed integral with the stem B and constituting part of the present invention. Said head or enlargement is disposed in the recess 2' of disk E and comprises a circular flange m, interposed and adapted to move vertically as well as turn between the upper sides of the abutments Z and the under side of the nut F, a diametrical portion 07., arranged below the portion 777, and in the same horizontal plane as the abutments Z and adapted to move be tween and bring up against opposing sides of said abutments, and a rounded protuberancep at the under side of the diametrical portion, di posed in the depression 7c of the disk.

In Fig. 1 of the drawings the .disk E is shown as pressed tightly against the seat I) and the spring D as compressed between the nut C and the top of the bonnet 0. Now when the stem is turned to open the valve a quarter-turn of the stem will take place before the diametrical portion a of the stem assumes a position at right angles to that shown in Fig. 2 and the disk is turned. Such partial rotation of the stem precedent to rotary movement of the disk suffices to lessen the pressure of the disk against the seat I) and permits of the valve being opened with but a minimum amount of effort. While this is so, it will be observed that when the diametrical portion n assumes a position at right angles to that shown and the rotation of the stem is continued the disk will turn with the stem, but at the same time will be pressed and ground against the seat 19 until the spring D is expanded. It will also be observed that when the valve is open and the springD expanded the rotation of the stem in the direction to close the valve will carry the disk against the seat I) while the spring is still expanded. From this it follows that incident to the continued rotation of the stem the disk will be pressed and ground against the seat until the spring D is compressed, as shown in Fig. 1.

It will be appreciated from the foregoing that our improved valve is at once self-grinding and susceptible of being opened with but a minimum amount of effort.

When desired, our invention may be embodied in an ordinary regrinding-valve, also the disk may be clutched or otherwise suitably connected to the stem in such manner as to afiord lost motion between the stem and disk-t. e., permit the stem to make a partial rotation before the disk tnrnswithout departure from our invention.

hen out-improved disk connection is embodied in an ordinary regrinding-valve, it will be seen that there is no necessity of taking the valve apart to make the disk solid or fixed with respect to the stem.

We have entered into a detailed description of the construction and relative arrangement of the parts embraced in the present and preferred embodiment of our invention in order to imparta full, clear, and exact understanding of the same. We do not desire, however, to be understood as confining ourselves to such specific construction and arrangement of parts, as such changes or modifications may be made in practice as fairly fall within the scope of our invention as claimed.

Having described our invention, what we claim, and desire to secure by Letters Patent, 1s

1. In a valve, the combination of a casing containing a valve-seat,a nut movable toward and from the valve-seat, and held, by the easing, against turning, aspring, interposed between the casing and the nut, for pressing the latter toward the valve-seat, a disk arranged to bear at one side against the valve-seat, and having a recess in its opposite side, and also having an abutment in said recess, and arotary stem having a threaded portion bearing in the nut, and also having an enlargement, at its inner end, secured in the recess of the disk, and adapted to turn in said recess and bring up against the abutment therein.

2. In a valve, the combination of a casing containing avalve-seat, a n ut movable toward and from the valve-seat, and held, by the casing, against turning, a spring, interposed between the casing and the nut, for pressing the latter toward the valve-seat, a disk arranged to hear at one side against the valve-seat, and having a recess in its opposite side, and also having a central depression in the bottom of the recess, and threads and an abutment on the side wall thereof, an annular nut arranged in the recess, and engaging the threads on the side wall thereof, and a rotary stern having a threaded portion bearing in the nut, and also having a head or enlargement, at its inner end, arranged in the recess of the disk, and comprising a flange interposed between the abutment and the annular nut, a diametrical portion at the inner side of the flange, adapted to bring up against the abutment, and a central protuberance on said diametrical portion, seated in the depression in the bottom wall of the recess.

3. In a valve, the combination of a casing containing a valve-seat, a rotary and endwisemovable stem mounted in the casing, a spring for pressing said stem toward the valve-seat, a disk carried by the stem and arranged to bear against the valve-seat, and coacting means on the stem and the disk, whereby the stem is enabled to turn partially with respect to the disk, and then turn said disk.

4. In a valve, the combination of a casing containing a valve-seat, a nut movable toward and from the valve-seat, and held, by the easing against turning, a rotary and endwisemovable stein having a threaded portion bearing in the nut, a spring, surrounding the stem and interposed between the casing and the nut, for pressing the stem toward the valveseat, a disk carried by the stem, and arranged to bear against the valve-seat, and coacting means on the stem and the disk, whereby the stem is enabled to turn partially with respect to the disk, and then turn said disk.

5. In a valve, a disk having a circular recess in one side, and also having a central depression in the bottom of said recess, and threads and diametrically opposite, sectorshaped abutments on the side wall thereof, and an annular nut arranged in the recess and engaging the threads of the disk, in combination with a stem having a head arranged in the recess of the disk, and comprising a fiange adapted to turn and move vertically between the abutments and the annular nut, a diametrical portion, at the inner side of the flange, adapted to swing between opposing faces of the abutments, and a central protuberance on said diametrical portion, arranged in the depression in the bottom of the recess.

In testimony whereof we have hereunto set our hands in presence of two subscribing witnesses.

LORENS SWENSON. JOHN S. SWENSON. \Vitnesses:

S. A. CONVERSE, ABBIE J. CONVERSE.

IlO 

